<template>
  <div>
    <el-switch v-model="draggable" active-text="开启拖拽" inactive-text="关闭拖拽"></el-switch>&emsp;
    <el-button type="primary" v-if="draggable" @click="batchSave">批量保存</el-button>
    <el-button type="danger" @click="batchDelete">批量删除</el-button><br /><br />
    <el-tree ref="menuTree" :draggable="draggable" :data="menus" :allow-drop="allowDrop" @node-drop="handleDrop" :props="defaultProps" :expand-on-click-node="false" show-checkbox node-key="catId" :default-expanded-keys="expandedKeys">
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>&nbsp;&nbsp;
        <span>
          <el-button v-if="node.level <= 2" type="text" size="mini" @click="() => append(data)">
            增加
          </el-button>
          <el-button v-if="node.level <= 2" type="text" size="mini" @click="() => edit(data)">
            修改
          </el-button>
          <el-button v-if="node.childNodes.length == 0" type="text" size="mini" @click="() => remove(node, data)">
            删除
          </el-button>
        </span>
      </span>
    </el-tree>
    <el-dialog :title="title" :visible.sync="dialogVisible" width="30%" :close-on-click-modal="false">
      <el-form :model="category" label-width="80px">
        <el-form-item label="分类名称">
          <el-input v-model="category.name"></el-input>
        </el-form-item>
        <el-form-item label="图标">
          <el-input v-model="category.icon"></el-input>
        </el-form-item>
        <el-form-item label="计量单位">
          <el-input v-model="category.productUnit"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="submitData">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data () {
    return {
      pCid: [],
      draggable: false,
      updateNodes: [],
      maxLevel: 0,
      title: "",
      dialogType: '', // add
      category: {
        name: '',
        parentCid: 0,
        catLevel: 0,
        showStatus: 1,
        sort: 0,
        icon: '',
        productUnit: ""
      },
      dialogVisible: false,
      expandedKeys: [],
      menus: [],
      defaultProps: {
        children: 'children',
        label: 'name'
      }
    };
  },
  components: {},
  computed: {},
  methods: {
    getMenus () {
      this.$http({
        url: this.$http.adornUrl('/product/category/list/tree'),
        method: 'get'
      }).then(data => {
        this.menus = data.data.data;
      })
    },
    allowDrop (draggingNode, dropNode, type) {
      this.countNodeLevel(draggingNode.data);
      let deep = this.maxLevel - draggingNode.level + 1;
      if (type == "inner") {
        return (deep + dropNode.level) <= 3;
      } else {
        return (deep + dropNode.parent.level) <= 3;
      }
    },
    countNodeLevel (node) {
      if (node.childNodes != null && node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          if (node.childNodes[i].level > this.maxLevel) {
            this.maxLevel = node.childNodes[i].level;
          }
          this.countNodeLevel(node.childNodes[i]);
        }
      }
    },
    append (data) {
      this.dialogType = "add";
      this.title = "添加分类";
      this.dialogVisible = true;
      this.category.parentCid = data.catId;
      this.category.catLevel = data.catLevel * 1 + 1;
      this.catId = null;
      this.icon = "";
    },
    edit (data) {
      this.dialogType = "edit";
      this.title = "修改分类";
      this.dialogVisible = true;
      this.category.parentCid = data.catId;
      this.category.catLevel = data.catLevel * 1 + 1;
      this.$http({
        url: this.$http.adornUrl(`/product/category/info/${data.catId}`),
        method: 'get'
      }).then(({ data }) => {
        if (data && data.code === 0) {
          this.category.name = data.data.name;
          this.category.catId = data.data.catId;
          this.category.icon = data.data.icon;
          this.category.productUnit = data.data.productUnit;
        } else {
          this.$message.error(data.msg)
        }
      })
    },
    remove (node, data) {
      let ids = [data.catId];
      this.$confirm(`是否删除{${data.name}}?`, '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        this.$http({
          url: this.$http.adornUrl('/product/category/delete'),
          method: 'post',
          data: this.$http.adornData(ids, false)
        }).then(({ data }) => {
          if (data && data.code === 0) {
            this.$message({
              message: '菜单删除成功！',
              type: 'success'
            });
            this.getMenus();
            this.expandedKeys = [node.parent.data.catId];
          } else {
            this.message.error(data.msg)
          }
        }).catch(() => {
        });
      }).catch(()=>{});
    },
    addCategory () {
      this.$http({
        url: this.$http.adornUrl('/product/category/save'),
        method: 'post',
        data: this.$http.adornData(this.category, false)
      }).then(({ data }) => {
        if (data && data.code === 0) {
          this.$message({
            message: '菜单保存成功！',
            type: 'success',
            duration: 500,
            onClose: () => {
            }
          })
          this.dialogVisible = false;
          this.getMenus();
          this.expandedKeys = [this.category.parentCid];
        } else {
          this.$message.error(data.msg)
        }
      })
    },
    editCategory () {
      let { catId, name, icon, productUnit } = this.category;
      this.$http({
        url: this.$http.adornUrl('/product/category/update'),
        method: 'post',
        data: this.$http.adornData({ catId, name, icon, productUnit }, false)
      }).then(({ data }) => {
        if (data && data.code === 0) {
          this.$message({
            message: '操作成功',
            type: 'success'
          })
          this.dialogVisible = false;
          this.getMenus();
          this.expandedKeys = [this.category.parentCid];
        } else {
          this.$message.error(data.msg)
        }
      })
    },
    submitData () {
      if (this.dialogType == "add") {
        this.addCategory();
      }
      if (this.dialogType == "edit") {
        this.editCategory();
      }
    },
    handleDrop (draggingNode, dropNode, dropType, ev) {
      //1、当前节点最新的父节点id
      let pCid = 0;
      let siblings = null;
      if (dropType == "before" || dropType == "after") {
        pCid = dropNode.parent.data.catId == undefined ? 0 : dropNode.parent.data.catId;
        siblings = dropNode.parent.childNodes;
      } else {
        pCid = dropNode.data.catId;
        siblings = dropNode.childNodes;
      }
      this.pCid.push(pCid);
      //2、当前拖拽节点的最新顺序，
      for (let i = 0; i < siblings.length; i++) {
        if (siblings[i].data.catId == draggingNode.data.catId) {
          //如果遍历的是当前正在拖拽的节点
          let catLevel = draggingNode.level;
          if (siblings[i].level != draggingNode.level) {
            //当前节点的层级发生变化
            catLevel = siblings[i].level;
            //修改他子节点的层级
            this.updateChildNodeLevel(siblings[i]);
          }
          this.updateNodes.push({
            catId: siblings[i].data.catId,
            sort: i,
            parentCid: pCid,
            catLevel: catLevel
          });
        } else {
          this.updateNodes.push({ catId: siblings[i].data.catId, sort: i });
        }
      }
    },
    updateChildNodeLevel (node) {
      if (node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          var cNode = node.childNodes[i].data;
          this.updateNodes.push({
            catId: cNode.catId,
            catLevel: node.childNodes[i].level
          });
          this.updateChildNodeLevel(node.childNodes[i]);
        }
      }
    },
    batchDelete () {
      let catIds = [];
      let checkedNodes = this.$refs.menuTree.getCheckedNodes();
      for (let i = 0; i < checkedNodes.length; i++) {
        catIds.push(checkedNodes[i].catId);
      }
      this.$confirm(`是否批量删除【${catIds}】菜单?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning"
      })
        .then(() => {
          this.$http({
            url: this.$http.adornUrl("/product/category/delete"),
            method: "post",
            data: this.$http.adornData(catIds, false)
          }).then(({ data }) => {
            this.$message({
              message: "菜单批量删除成功",
              type: "success"
            });
            this.getMenus();
          });
        })
        .catch(() => { });
    },
    batchSave () {
      this.$http({
        url: this.$http.adornUrl("/product/category/update/sort"),
        method: "post",
        data: this.$http.adornData(this.updateNodes, false)
      }).then(({ data }) => {
        this.$message({
          message: "菜单顺序等修改成功",
          type: "success"
        });
        //刷新出新的菜单
        this.getMenus();
        //设置需要默认展开的菜单
        this.expandedKey = this.pCid;
        this.updateNodes = [];
        this.maxLevel = 0;
      });
    },
  },
  created: function () {
    this.getMenus();
  },
  mounted: function () {

  }
}
</script>